Although the 43-year-old looked as handsome as ever - it became apparent that he'd forgotten to fasten his trousers after a quick toilet break.

Thankfully, Ben's belt managed to save the star from pulling an Orlando Bloom in the middle of London.

Ben was left red-faced after the incident (Image: Blitz Pictures)

Oh dear... (Image: Blitz Pictures)

Not even Batman can escape a fashion faux pas it seems.

It comes as Bennifer continue to fuel rumours that they are getting back together.

Last month it was reported that the Hollywood couple, who shocked fans last year when they announced they were splitting after ten years of marriage, have yet to file for divorce .

He was put together on the red carpet (Image: WireImage)

The couple have fuelled rumours they're reuniting (Image: Splash) According to TMZ , despite being separated for over a year, neither Ben or Jen have taken any steps to begin dissolving their marriage.

A source said: "Jennifer followed Ben to England and the trip has given her a whole new outlook on their future.

"She still feels conflicted, and she's only telling close friends that she's started to open up to the idea that they could get back together.

"She thinks they have a long road ahead of them, but Ben is already proving to her that he's committed to changing."